It could be worse.. I found a supposedly full guide to PS via google not too long ago (it was only about 30% complete though!! .. and the people who'd made it had stolen the maps that I'd made!! - very entertaining!!).
Thankfully that site is now down.
As far as I know though... you're okay to keep your maps, guides, spoilers, etc. for your own (and your guilds) use... just not publicly, and preferably under some sort of password protection is good.